Showing papers in "Marine Structures in 1992"

TL;DR: In this article, an analytical model for predicting the axial-torsional structural behavior of flexible pipes, umbilicals and marine cables is presented, based on the interaction between the component layers of a generic flexible structure.

TL;DR: A general analytical model to predict the flexural structural behavior of multiple layer flexible structures such as flexible pipes, umbilicals and amrine cables is presented in this paper, which is shown to be dominated by relative movement between component layers once a critical curvature has been exceeded.

TL;DR: In this paper, a mathematically rigorous approach is presented for the calculation of pressure and internal flow induced forces on flexible risers and other curved pipes using an approximate and exact method.

TL;DR: The International Association of Classification Societies (IACS) requirements have been drawn up to unify the requirements of classification rule of the societies as mentioned in this paper, which forms the basic structural requirement for hull strength.

TL;DR: In this article, the authors present results from static and dynamic analyses of standard flexible riser systems performed by 11 different institutions using their in-house computer programs, and report results in such a way that it can provide a 'benchmark' test for users and programmers of computer codes for flexible Riser analysis.

TL;DR: In this paper, the authors present the methodology behind flexible pipe life prediction including analytical determination of pipe stiffness, interlayer contact pressures, stress recovery, slip between layers, wear and fatigue.

TL;DR: In this paper, a finite element analysis using 3-D isoparametric 20 noded elements was carried out to find a simple, practical and sufficiently accurate method for finding the natural frequencies of a propeller shaft assembly.

TL;DR: In this article, a rule-based overall design methodology for midship structures of small inland waterways vessels is presented, where the designer, under conflicting requirements, can select the optimum design by using a combined objective function with priority factors assigned to individual design criteria.

TL;DR: In this article, the stability of a simply supported square plate with openings under in-plane loading is analyzed using a Finite Element program BUCSAP (BUCkling Structural Analysis Program).

TL;DR: In this paper, structural perturbation theory has been used to relate two structural states modeled by the same finite element (FE) model but described by different values of the design variables.

TL;DR: In this paper, a method based on Fourier analysis was proposed to determine the natural frequencies of single and multiple flexible riser systems from the numerically predicted results, where the natural vibration of the system is introduced by displacing and then releasing a point along the riser.

TL;DR: In this article, a parametric study based on numerical analysis using an efficient non-linear finite element method code is presented for the simulation of the interactive flexural-torsional failure behavior of flat-bar stiffeners in plates under uniform axial compression.

TL;DR: It is suggested here that such a large number of variables is best handled in any dimensional analysis by the matrix method, a rigorous method in which variables are manipulated by simple, well defined, rules to formulate the dimensionless π terms.

TL;DR: In this article, experimental tests performed on a hydroelastic small-scale model of a tension leg platform for deep water are reported, and a comparison between the processed experimental dynamic signals and theoretical responses obtained with a simplified six degrees of freedom model are made.

TL;DR: In this article, a review of the state of knowledge of internal mechanical effects of flexible tubulars is presented and the consequences of these in static and dynamic failure prediction are also discussed.

TL;DR: In this article, the authors developed a tool which allows the computation of such structures, reducing to the greatest extent the simplifications and approximations related to the representation of the structural geometry, the loading and the interdependence of the various elements (such as shell plating, stiffeners, deck beams, web frames and stringers).

TL;DR: In this article, a series of time domain simulations is carried out for a Lazy-S flexible riser, from which response statistics, including extreme responses, are estimated, and it is concluded that a three-parameter Weibull distribution is significantly more accurate than a Rayleigh distribution for representing the short-term response peaks, especially for more energetic seas where the response distributions tend to decay slowly.

TL;DR: In this article, the problem of subharmonic oscillations attributable to the interaction between wave forces and the structural motion is investigated both analytically and experimentally, and the sensitivity of this nonlinear phenomenon with respect to some system parameters and initial conditions is evaluated.

TL;DR: In this article, the effects of structure configuration, mode order, displacement amplitude and temperature on structural damping are discussed and representative damping values are provided, which can be used to predict damping value of full scale marine risers.

TL;DR: In this article, a tentative calibration of safety coefficients in an ultimate limit state format is demonstrated based on estimated uncertainty measures and chosen target reliability levels for flexible pipes under the combined load effects.

TL;DR: In this article, two methods for the estimation of kinematics in the crest region are compared, one based on a particular physical interpretation of the Airy superposition model and the other based on the well-known Wheeler stretching.

TL;DR: In this article, the authors define the primary considerations affecting flexible riser installation and determine further and highlight which areas of product specification may be addressed with a view to improving the economics of installation operations.

TL;DR: In this paper, the authors deal with stochastic wave models and their influence on wave load modelling of marine structures, and an entirely new quadratic model for the wave elevation is outlined.

TL;DR: In this article, the cathodic polarization curves as a function of the calcareous deposit formed on a surface cathodically protected by a sacrificial zinc anode were determined using an electrochemical cell containing a synthetic scale-forming seawater solution prepared according to ASTM D 1141.